Meaning of “arbitrary” - Learner’s Dictionary

arbitrary

adjective uk us /ˈɑːbɪtrəri/

not based on a system or principles and often seeming unfair:

an arbitrary decision
arbitrarily uk us /ˌɑːbɪˈtreərəli/ adverb

(Definition of “arbitrary” from the Cambridge Learner’s Dictionary © Cambridge University Press)